Media playback is unsupported on your device

Growth of forests 'restricted' since the hot summer of 1976

24 July 2013 Last updated at 13:40 BST

The sizzling summer of 1976 caused permanent changes to British forests, new research suggests.

Scientific work was carried out at Lady Wood Park in the Wye Valley. The 111 acre site is a national nature reserve and is attractive to researchers because it has been deliberately unmanaged since 1945.

The study found growth of the trees is still restricted more than 30 years later.

Sian Lloyd went to the Wye Valley in Monmouthshire to see the damage.

Copyright © 2015 BBC. The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.